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United States Patent | 5,675,319 |
Rivenberg ,   et al. | October 7, 1997 |
A tamper detection device can determine whether a housing containing a device has been tampered with either by having the housing penetrated or by an attempt to remove a cover from the housing. The tamper detection device may be a capacitor which is placed across a portion of the housing and whose capacitance changes if it is penetrated. The temper detection device may also be a flexible circuit having conductive strips thereon forming a circuit with means to cause an open circuit if the housing is penetrated or the cover removed from the housing.
Inventors: | Rivenberg; Howard Christopher (Mercer, NJ); Levine; Aaron William (Mercer, NJ); Desai; Nitin Vithalbhai (Mercer, NJ) |
Assignee: | David Sarnoff Research Center, Inc. (Princeton, NJ) |
Appl. No.: | 638257 |
Filed: | April 26, 1996 |
Current U.S. Class: | 340/550; 340/540; 340/541; 340/562; 340/652 |
Intern'l Class: | G08B 013/06; G08B 013/10; G08B 013/22 |
Field of Search: | 340/550,562,541,652,540 |
5506566 | Apr., 1996 | Oldfield et al. | 340/550. |